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The book begins with a robust foundation. It introduces the classification of signals and systems, providing the mathematical prerequisites necessary for understanding communication. The chapters on Fourier Series and Fourier Transform are particularly noteworthy. Unlike many Western textbooks that assume a high level of prior knowledge, Singh and Sapre revisit the basics, making it accessible for undergraduate students. To satisfy the search intent safely, here are
The alone are worth keeping the PDF on your desktop. The chapters on Fourier Series and Fourier Transform
The end of each chapter has a section labeled "Problems." The first 10 are usually formula-based. The last 5 are design-based. Aim to solve the first 15 in each chapter to pass any professional exam. The end of each chapter has a section labeled "Problems
The field of communication systems is evolving—moving toward massive MIMO, fiber optics, and quantum communication. However, the fundamentals of sampling, modulation, and error detection remain unchanged.